WO2012103559A1 - Method and device for controlling of switching and phase modulation of a liquid crystal cell - Google Patents

Method and device for controlling of switching and phase modulation of a liquid crystal cell Download PDF

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WO2012103559A1
WO2012103559A1 PCT/AM2011/000002 AM2011000002W WO2012103559A1 WO 2012103559 A1 WO2012103559 A1 WO 2012103559A1 AM 2011000002 W AM2011000002 W AM 2011000002W WO 2012103559 A1 WO2012103559 A1 WO 2012103559A1
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liquid crystal
crystal cell
substrates
nematic liquid
voltage
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PCT/AM2011/000002
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French (fr)
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Hakob MARGARYAN
Vladimir Aroutiounian
Nune HAKOBYAN
Valeri ABRAHAMYAN
David HOVHANNISYAN
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"Yerevan State University" State Not Commercial Organization
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134381—Hybrid switching mode, i.e. for applying an electric field with components parallel and orthogonal to the substrates
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2203/00—Function characteristic
    • G02F2203/50—Phase-only modulation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0434—Flat panel display in which a field is applied parallel to the display plane

Definitions

  • This invention refers to photonics, in particular to the development of optoelectronic components of photonics.
  • Possible fields of the invention application are: adaptive optics, optical correlation, image processing and analysis, holographic record of information, as well as displays.
  • the electro-optical method of controlling of birefringence of liquid crystals is known [1] according to which a layer of the nematic liquid crystal (NLC) with uniform distribution of director is reoriented in external electric field (Freedericksz electro-optical effect).
  • NLC nematic liquid crystal
  • Freedericksz electro-optical effect is commonly used in such LC-based devices as phase retarders, light valves, spatial light modulators and LC displays.
  • the basic technical characteristics of these devices are: the depth of phase modulation of the light and switching time.
  • a new type of LC is used [2] or the thickness of LC layer is reduced, and the latter in conjunction with reduced switching time introduces reduction in the depth of phase modulation.
  • the electro-optical method of controlling of LC birefringence is chosen for the closest prototype, according to which an electric field is applied between the LC cell substrates in consequence the birefringence of NLC with uniform distribution of director changes [3].
  • LC cells have the following two operation modes: as an electro-optically controlled light valve and as a phase retarder.
  • the LC cell as a light valve in the prototype, works as follows: planar oriented NLC cell is placed between the crossed polarizers so that the incident light beam to be oriented at 45° angle with respect to the of NLC director, and the control voltage is applied between the two substrates of the NLC cell. A change in the value of the applied voltage effects a different orientation of the NLC director and thereby different magnitudes of intensity of the light beam passing through the cell. Thus the intensity of monochromatic light passing through the system is controlled by varying the amplitude of applied voltage in a proper way.
  • the switching time is conditional upon the speed of both the reorientation and relaxation processes in NLC.
  • the minimum on/off transition time is achieved by changing the induced birefringence (by applying corresponding voltage) so that the phase shift to be ⁇ radian.
  • quick reorientation is achieved by applying a voltage of around the value of 1.3 times higher than the threshold voltage of Freedericksz transition in order to circumvent random and undesirable hydrodynamic flows [3-5].
  • the method of double-frequency control is used [2, 6, 7], which, however, is applicable to the special type of double-frequency LCs only.
  • phase retarder the LC cell operates in the following way: a voltage is applied between the substrates of NLC cell, and due to electro-optical effect the birefringence of NLC is changed. Therefore, the light passing through the NLC layer is subjected to a phase-shift in accordance with the applied voltage.
  • the phase of the light beam can be controlled by changing the amplitude of external voltage.
  • a basic characteristic of such a device is the dependence of phase shift ⁇ on the variation of the voltageAF , i.e. the transfer coefficient ⁇ / ⁇ .
  • the ⁇ ( ⁇ ) curve reaches its saturation region, with further decrease in transfer coefficient. In this region, as the voltage changes by AV the phase shift changes slightly in close proximity of ⁇ .
  • the device On one hand it is preferable the device to operate in this range of control voltage with higher value of k and on the other hand in case of greater values of k the noise component of external voltage will cause random and uncontrolled changes in the phase.
  • transfer coefficient k decreases significantly (saturation mode). Though in this case maximum speed and noise resistance is achieved, the transfer coefficient ⁇ / ⁇ and thereby the modulation depth is significantly low. From aforesaid it could be concluded that there is an inconsistency between high speed and deep modulation.
  • the objective of this invention is the improvement of time and modulation characteristics of LC-based devices with a method enabling to choose optimum operation mode of LC cells evading inconsistency between high speed and deep modulation.
  • birefringence of a liquid crystal is controlled by applying external voltage (hereafter- transverse voltage, V ⁇ ) between two substrates of a LC cell
  • the birefringence of NLC is controlled by applying two control voltages: conventional V L and additional voltage along one of substrates of planar oriented NLC cell (hereafter - longitudinal voltage, V n ).
  • the method is put into action with a device comprising two glass substrates, inner surfaces of which are covered with transparent conducting layers; a spacer between the two substrates providing fixed distance between the substrates; nematic liquid crystal filling the space between the substrates; alignment layer providing planar orientation of nematic liquid crystal; one electric contact formed on each transparent conducting layer.
  • a second electric contact is used to apply the additional control voltage.
  • a device embodying claimed method comprises of the LC cell with two glass substrates (1) inner surfaces of which are covered with light-transparent conducting layers (Indium-Tin Oxide, ITO) (2), spacers providing a fixed gap between the substrates (3), nematic liquid crystal layer (4) sandwiched between the substrates, a polymer alignment layer (5) providing planar orientation, and three metal contact areas (6) designed to apply control voltage: two on transparent conducting layer on one of substrates, and one on transparent conducting layer on the other substrate.
  • ITO Indium-Tin Oxide
  • FIG. 2 the schematic diagram of setup of embodying claimed method is given. It comprises a two-channel generator run by NI 6025 DAQ card (7), a computer (8), a voltage amplifier (9), the LC cell (12) arranged between two crossed polarizers (10, 11), a light source (632.8 nm He:Ne laser) (13), and a photo-detector (14).
  • the claimed method is realized for the LC cell given in Fig.1.
  • the claimed method is realized with an setup schematically given in Fig.2. It comprises of a two-channel generator run by a NI 6025 DAQ card (7) and a voltage amplifier (9).
  • a software package developed in LabView environment enables one to shape both bipolar rectangular electrical pulses of different amplitudes, frequency and duration, and control signals of other shape, for example TNE (Tr Egyptian Nematic Effect).
  • the transverse control voltage is applied between NLC substrates from the first channel, and the longitudinal control voltage from the second channel. Both control signals are generated either synchronously or with fixed phase shift.
  • the signal read by NI 6025 card (7) is inputted to the computer (8) in the form of digitalized data.
  • the NLC light valve is controlled with 1 kHz transverse voltage V L of TNE shape.
  • the amplitudes of the TNE signal fractions being chosen so to provide complete "on” and “off states and on/of switching in the range of phase shift at close proximity of ⁇ .
  • the switch-on time is 15.17 ms
  • the switch-off time is 11.16 ms.
  • a NLC cell operates as a light valve in the following way: TNE shape transverse voltage V ⁇ provides the valve running. Synchronously with the "on" front of TNE signal the longitudinal control voltage V n is applied in a shape of a single bipolar pulse. In this case, as it is seen from the transient dynamics (Fig.4) the switch-on time is 700 ⁇ , with switch-off time of 1 1.06 ms. Hence the claimed method provides an opportunity to decrease the switch-on time of a NLC electro-optical gate 20 times and the overall switching time-2.5 times.
  • the NCL cell operates by applying V transverse voltage of 1 kHz and from the phase shift vs. control voltage curve, ⁇ ( ⁇ ⁇ ) (Fig.5) the voltage value corresponding to necessary phase shift is chosen.
  • the NLC cell is controlled by synchronously and simultaneously applied transverse and longitudinal electric pulses.
  • the phase shift of light is dependant on both transverse V ⁇ and longitudinal V u control electric pulses.
  • V Lth is the threshold value of transverse voltage, at which
  • the claimed method gives an opportunity to increase transfer coefficient ⁇ / ⁇ in two orders.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Liquid Crystal (AREA)

Abstract

The invention refers to photonics, in particular to the development of optoelectronic components of photonics. Possible fields of the invention application are: adaptive optics, optical correlation, image processing, holographic record, as well as displays. In order to control the birefringence of planar oriented nematic liquid crystal simultaneously and synchronously with the voltage applied between two substrates of nematic liquid crystal cell an additional voltage - bipolar electric pulse, is applied along to one of substraits of the liquid crystal cell. The controlling of the bievergence of nematic liquid crystal with proposed method create an opportunity to reduce switching time and improve the modulation characteristics of the nematic liquid crystal cell. To realize the method a nematic liquid crystal cell is proposed in which one contact area is formed on the transparent conducting layer of one substrate, and two contact areas are formed on the transparent conducting layer of the other substrate to provide control voltages application.

Description

Method and device for controlling of switching and phase modulation of a liquid crystal cell.
This invention refers to photonics, in particular to the development of optoelectronic components of photonics. Possible fields of the invention application are: adaptive optics, optical correlation, image processing and analysis, holographic record of information, as well as displays.
The electro-optical method of controlling of birefringence of liquid crystals (LC) is known [1] according to which a layer of the nematic liquid crystal (NLC) with uniform distribution of director is reoriented in external electric field (Freedericksz electro-optical effect). This effect is commonly used in such LC-based devices as phase retarders, light valves, spatial light modulators and LC displays. The basic technical characteristics of these devices are: the depth of phase modulation of the light and switching time. In order to achieve improved modulation and time characteristics of LC-based devices either a new type of LC is used [2] or the thickness of LC layer is reduced, and the latter in conjunction with reduced switching time introduces reduction in the depth of phase modulation.
The electro-optical method of controlling of LC birefringence is chosen for the closest prototype, according to which an electric field is applied between the LC cell substrates in consequence the birefringence of NLC with uniform distribution of director changes [3].
It is known, that LC cells have the following two operation modes: as an electro-optically controlled light valve and as a phase retarder.
The LC cell, as a light valve in the prototype, works as follows: planar oriented NLC cell is placed between the crossed polarizers so that the incident light beam to be oriented at 45° angle with respect to the of NLC director, and the control voltage is applied between the two substrates of the NLC cell. A change in the value of the applied voltage effects a different orientation of the NLC director and thereby different magnitudes of intensity of the light beam passing through the cell. Thus the intensity of monochromatic light passing through the system is controlled by varying the amplitude of applied voltage in a proper way.
The switching time, the basic characteristics of such a system, is conditional upon the speed of both the reorientation and relaxation processes in NLC. In the prototype, the minimum on/off transition time is achieved by changing the induced birefringence (by applying corresponding voltage) so that the phase shift to be π radian. In the prototype quick reorientation is achieved by applying a voltage of around the value of 1.3 times higher than the threshold voltage of Freedericksz transition in order to circumvent random and undesirable hydrodynamic flows [3-5]. To reduce the relaxation time the method of double-frequency control is used [2, 6, 7], which, however, is applicable to the special type of double-frequency LCs only.
As phase retarder the LC cell operates in the following way: a voltage is applied between the substrates of NLC cell, and due to electro-optical effect the birefringence of NLC is changed. Therefore, the light passing through the NLC layer is subjected to a phase-shift in accordance with the applied voltage. Thus, the phase of the light beam can be controlled by changing the amplitude of external voltage.
A basic characteristic of such a device is the dependence of phase shift Δφ on the variation of the voltageAF , i.e. the transfer coefficient δφ/δ¥ . In the initial linear region on phase shift vs. applied voltage curve, A (AV) a slight variation of AV ieads to the significant change of phase shift Δφ = k-AV , where & = δφ/δΓ is the transfer coefficient. With farther increase in control voltage the Δφ(ΔΚ) curve reaches its saturation region, with further decrease in transfer coefficient. In this region, as the voltage changes by AV the phase shift changes slightly in close proximity of π . On one hand it is preferable the device to operate in this range of control voltage with higher value of k and on the other hand in case of greater values of k the noise component of external voltage will cause random and uncontrolled changes in the phase. Besides, from the point of view of increasing the speed it is advantageous to run the device in the range of higher values of control voltage, where transfer coefficient k decreases significantly (saturation mode). Though in this case maximum speed and noise resistance is achieved, the transfer coefficient δφ/δΡ and thereby the modulation depth is significantly low. From aforesaid it could be concluded that there is an inconsistency between high speed and deep modulation.
The objective of this invention is the improvement of time and modulation characteristics of LC-based devices with a method enabling to choose optimum operation mode of LC cells evading inconsistency between high speed and deep modulation.
What is claimed is:
In the known method birefringence of a liquid crystal is controlled by applying external voltage (hereafter- transverse voltage, V± ) between two substrates of a LC cell, in this invention the birefringence of NLC is controlled by applying two control voltages: conventional VL and additional voltage along one of substrates of planar oriented NLC cell (hereafter - longitudinal voltage, Vn). The method is put into action with a device comprising two glass substrates, inner surfaces of which are covered with transparent conducting layers; a spacer between the two substrates providing fixed distance between the substrates; nematic liquid crystal filling the space between the substrates; alignment layer providing planar orientation of nematic liquid crystal; one electric contact formed on each transparent conducting layer. In this invention on transparent conducting layer of one of substrates a second electric contact is used to apply the additional control voltage.
In Fig.1 a device embodying claimed method is schematically given. It comprises of the LC cell with two glass substrates (1) inner surfaces of which are covered with light-transparent conducting layers (Indium-Tin Oxide, ITO) (2), spacers providing a fixed gap between the substrates (3), nematic liquid crystal layer (4) sandwiched between the substrates, a polymer alignment layer (5) providing planar orientation, and three metal contact areas (6) designed to apply control voltage: two on transparent conducting layer on one of substrates, and one on transparent conducting layer on the other substrate.
In Fig. 2 the schematic diagram of setup of embodying claimed method is given. It comprises a two-channel generator run by NI 6025 DAQ card (7), a computer (8), a voltage amplifier (9), the LC cell (12) arranged between two crossed polarizers (10, 11), a light source (632.8 nm He:Ne laser) (13), and a photo-detector (14).
In Fig.3 the switching dynamics of the LC electro-optically controlled light valve and the control signal shape are given in case of controlling with known method.
In Fig.4 the switching dynamics of LC electro-optically controlled light valve and the control signal shape are given in case of controlling with claimed method.
In Fig.5 the phase shift of LC phase retarder vs. control voltage is given in case of known method.
In Fig.6 the dependence of phase shift vs. longitudinal voltage of a phase retarder is given for fixed values of transverse voltage.
In Fig.7 the phase shift vs. transverse voltage is given for fixed values of longitudinal voltage in case of claimed method.
The claimed method is realized for the LC cell given in Fig.1.
The claimed method is realized with an setup schematically given in Fig.2. It comprises of a two-channel generator run by a NI 6025 DAQ card (7) and a voltage amplifier (9). A software package developed in LabView environment enables one to shape both bipolar rectangular electrical pulses of different amplitudes, frequency and duration, and control signals of other shape, for example TNE (Trancient Nematic Effect). The transverse control voltage is applied between NLC substrates from the first channel, and the longitudinal control voltage from the second channel. Both control signals are generated either synchronously or with fixed phase shift. Incident light (13), passing through NLC cell (12) arranged in between two crossed polarizers (10, 11), then is registered by the photo-detector (14). The signal read by NI 6025 card (7) is inputted to the computer (8) in the form of digitalized data.
Example 1:
In the known method the NLC light valve is controlled with 1 kHz transverse voltage VL of TNE shape. The amplitudes of the TNE signal fractions being chosen so to provide complete "on" and "off states and on/of switching in the range of phase shift at close proximity of π . According to switching dynamics given in Fig.3, the switch-on time is 15.17 ms, and the switch-off time is 11.16 ms.
In the present invention a NLC cell operates as a light valve in the following way: TNE shape transverse voltage V± provides the valve running. Synchronously with the "on" front of TNE signal the longitudinal control voltage Vn is applied in a shape of a single bipolar pulse. In this case, as it is seen from the transient dynamics (Fig.4) the switch-on time is 700 με, with switch-off time of 1 1.06 ms. Hence the claimed method provides an opportunity to decrease the switch-on time of a NLC electro-optical gate 20 times and the overall switching time-2.5 times.
Example 2:
In the known method as a phase retarder the NCL cell operates by applying V transverse voltage of 1 kHz and from the phase shift vs. control voltage curve, φ(νχ) (Fig.5) the voltage value corresponding to necessary phase shift is chosen.
In this invention the NLC cell is controlled by synchronously and simultaneously applied transverse and longitudinal electric pulses. In the claimed method the phase shift of light is dependant on both transverse V± and longitudinal Vu control electric pulses. At a fixed value of V by changing the amplitude of the longitudinal voltage by Δ^, a deviation in phase shift of is obtained, where VLth is the threshold value of transverse voltage, at which
Figure imgf000005_0001
Frederiksz transition occurs (Fig.6). And vice versa, having fixed VHQ value and changing the amplitude of transverse voltage by AV± a deviation in phase shift AV± is obtained
(Fig.7). In the claimed method electro-optically induced phase shift is presented as
Figure imgf000006_0001
The availability of two independent control voltages provides an opportunity to control the value of transfer coefficient δφ/δΓ working in the range of maximum speed and noise-resistance, chosing proper amplitudes of V± and Vn . In other words, the possibility of additional control of phase shift is created.
In the case of controlling NLC phase retarder by the known method (Fig.5), the variation of control voltage V± from 26V to 36V (in the range of maximum operational speed) the phase shift is changed from 2.05 π to 2.08 π and the transfer coefficient is 0.003 .
In the case of controlling NLC phase retarder by the claimed method as it is seen Fig.6, when controlling with the fixed amplitude of transverse voltage V (in given case the value of 26V is chosen, which corresponds to the maximum operating speed of device) variation of the amplitude 26.14V to 27.07V a phase shift alteration of 0.33 π is possible to reach. The transfer coefficient δφ/δΓ , in this case is 0.35 π .
Thus, the claimed method gives an opportunity to increase transfer coefficient δφ/δΚ in two orders.
Information sources:
1. L.M. Blinov, Electro-Optical and Magneto-Optical Effects in Liquid Crystals, Wiley, Chichester, 1984.
2. A.B. Golovin, S.V. Shiyanovskij, O.D. Lavrentovich. Fast Switching Dual-Frequency Liquid Crystal Cells with High Pretilt Angle, Driven by an Amplitude and Frequency Modulated Voltage. U.S. Provisional Patent Application. Serial No. 60/350,747.
3. L.M.Blinov, V.G. Chigrinov, Electrooptic Effects in Liquid Crystal Materials, Springer, 1993 - closest prototype.
4. V.G. Chigrinov and V.V. Belyaev, Kristallografiya 22, 603 (1977). 5. V.V. Belyaev, L.M. Blinov, and V.G. Rumyantsev, Mikroelektronika 5, 552 (1976).
6. V.V. Belyaev and V.G. Chigrinov, Kristallografiya 23, 811 (1978).
7. G. Baur, A. Stieb, and G. Meier, Appl. Phys. 2, 349 (1973); 6, 309 (1975).
8. H.K. Bucher, R.T. Klingbiel, and J.P. van Meter, Appl. Phys. Lett. 25, 186 (1974).

Claims

Claims
1. A method of controlling of switching and phase modulation of liquid crystal cell, according to which an electric field is applied between the substrates of a planar-oriented nemtic liquid crystal cell, changing thus the birefringence of nematic liquid crystal with uniform director distribution characterized by: in order to contol the birefringence of the liquid crystal, simultaneuosly and synchronously with the basic electric field an additional voltage - a bipolar electric pulse is applied along one of substrates of planar oriented liquid crystal cell.
2. A device for controlling of switching and phase modulation of liquid crystal cell comprising: two glass substrates, inner surfaces of which are covered with transparent conducting layer; a spacer between these substrates; nematic liquid crystall filling the space between the substrates; an alingment layer providing the planar orientataion of the nematic liquid crystal; one electric contact on transparent conducting layer of each substrates,
characterized by: one contact area is formed on the transparent conducting layer of one substrate, and two contact areas are formed on the transparent conducting layer of the other substrate to provide control voltages application.
PCT/AM2011/000002 2011-01-31 2011-06-20 Method and device for controlling of switching and phase modulation of a liquid crystal cell WO2012103559A1 (en)

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